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The Implications of Extreme Outflows from Extreme Starbursts
Heckman, Timothy M.; Borthakur, Sanchayeeta
Interstellar ultraviolet absorption lines provide crucial information about the properties of galactic outflows. In this paper, we augment our previous analysis of the systematic properties of starburst-driven galactic outflows by expanding our sample to include a rare population of starbursts with exceptionally high outflow velocities. In princip…
Iron Kα line of Kerr black holes with scalar hair
Bambi, Cosimo; Zhou, Menglei; Ni, Yueying +3 more
Recently, a family of hairy black holes in 4-dimensional Einstein gravity minimally coupled to a complex, massive scalar field was discovered [1]. Besides the mass M and spin angular momentum J, these objects are characterized by a Noether charge Q, measuring the amount of scalar hair, which is not associated to a Gauss law and cannot be measured …
Planck intermediate results. XLIX. Parity-violation constraints from polarization data
Miville-Deschênes, M. -A.; Bernard, J. -P.; Planck Collaboration +148 more
Parity-violating extensions of the standard electromagnetic theory cause in vacuo rotation of the plane of polarization of propagating photons. This effect, also known as cosmic birefringence, has an impact on the cosmic microwave background (CMB) anisotropy angular power spectra, producing non-vanishing T-B and E-B correlations that are otherwise…
Optically thick outflows in ultraluminous supersoft sources
Soria, R.; Urquhart, R.
Ultraluminous supersoft sources (ULSs) are defined by a thermal spectrum with colour temperatures ∼0.1 keV, bolometric luminosities ∼ a few 1039 erg s-1, and almost no emission above 1 keV. It has never been clear how they fit into the general scheme of accreting compact objects. To address this problem, we studied a sample o…
Spectro-photometric distances to stars: A general purpose Bayesian approach
Schneider, Donald P.; Steinmetz, Matthias; Girardi, Léo +16 more
Context. Determining distances to individual field stars is a necessary step towards mapping Galactic structure and determining spatial variations in the chemo-dynamical properties of stellar populations in the Milky Way.
Aims: In order to provide stellar distance estimates for various spectroscopic surveys, we have developed a code that esti…
Mass assembly and morphological transformations since z ∼ 3 from CANDELS
Daddi, E.; Kartaltepe, J. S.; Koekemoer, A. M. +14 more
We quantify the evolution of the stellar mass functions (SMFs) of star-forming and quiescent galaxies as a function of morphology from z ∼ 3 to the present. Our sample consists of ∼50 000 galaxies in the CANDELS fields (∼880 arcmin2), which we divide into four main morphological types, I.e. pure bulge-dominated systems, pure spiral disc…
Searching for decaying dark matter in deep XMM-Newton observation of the Draco dwarf spheroidal
Boyarsky, Alexey; Ruchayskiy, Oleg; Bulbul, Esra +6 more
We present results of a search for the 3.5 keV emission line in our recent very long (∼ 1.4 Ms) XMM-Newton observation of the Draco dwarf spheroidal galaxy. The astrophysical X-ray emission from such dark matter-dominated galaxies is faint, thus they provide a test for the dark matter origin of the 3.5 keV line previously detected in other massive…
The Evolution of the Faint End of the UV Luminosity Function during the Peak Epoch of Star Formation (1 < z < 3)
Teplitz, Harry I.; Richard, Johan; Scarlata, Claudia +9 more
We present a robust measurement of the rest-frame UV luminosity function (LF) and its evolution during the peak epoch of cosmic star formation at 1\lt z\lt 3. We use our deep near-ultraviolet imaging from WFC3/UVIS on the Hubble Space Telescope and existing Advanced Camera for Surveys (ACS)/WFC and WFC3/IR imaging of three lensing galaxy clusters,…
Continuum Enhancements in the Ultraviolet, the Visible and the Infrared during the X1 Flare on 2014 March 29
Krucker, Säm; Heinzel, Petr; Kleint, Lucia +1 more
Enhanced continuum brightness is observed in many flares (“white light flares”), yet it is still unclear which processes contribute to the emission. To understand the transport of energy needed to account for this emission, we must first identify both the emission processes and the emission source regions. Possibilities include heating in the chro…
New constraints on primordial gravitational waves from Planck 2015
Melchiorri, Alessandro; Pagano, Luca; Salvati, Laura
We show that the new precise measurements of Cosmic Microwave Background (CMB) temperature and polarization anisotropies made by the Planck satellite significantly improves previous constraints on the cosmic gravitational waves background (CGWB) at frequencies f >10-15 Hz. On scales smaller than the horizon at the time of decoupling,…